RSS may stand for Really Simple Syndication or it may not. Seems to depend on who you ask.
The idea is that you subscribe to information feeds on the net. When you are subscribed to a feed, then your RSS reader (which may be a separate program on your computer or may be built into your web browser) notices when new entries appear on a website or when changes are made to existing entries on a web site. For example, you could subscribe to The New York Times health section. If you did, then your RSS reader would be notified of (and, in most cases, sent a summary of) each article posted to the health section on The New York Times web site. You could subscribe to somebody's blog. Your reader would notice any new entries posted on that somebody's blog.
Your RSS reader polls all the feeds you've subscribed to at an interval you set in the reader. Every 10 minutes or every 30 minutes is typical. Most readers keep track of what you've already read and what is new, not unlike an email reader.
The idea is that you subscribe to information feeds on the net. When you are subscribed to a feed, then your RSS reader (which may be a separate program on your computer or may be built into your web browser) notices when new entries appear on a website or when changes are made to existing entries on a web site. For example, you could subscribe to The New York Times health section. If you did, then your RSS reader would be notified of (and, in most cases, sent a summary of) each article posted to the health section on The New York Times web site. You could subscribe to somebody's blog. Your reader would notice any new entries posted on that somebody's blog.
Your RSS reader polls all the feeds you've subscribed to at an interval you set in the reader. Every 10 minutes or every 30 minutes is typical. Most readers keep track of what you've already read and what is new, not unlike an email reader.